:root{
  --bg:#080B10;
  --surface:#0F141B;
  --surface-2:#141B24;
  --text:#E9EDF3;
  --muted:#8A93A0;
  --faint:#5A636F;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --accent:#5BE9C9;
  --accent-2:#7AA2FF;
  --shadow:0 30px 70px -30px rgba(0,0,0,.8);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
.mono{font-family:"JetBrains Mono",monospace}
.wrap{max-width:1120px;margin:0 auto;padding:0 30px;position:relative;z-index:2}

body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(60% 50% at 80% -5%,rgba(122,162,255,.16),transparent 60%),radial-gradient(55% 45% at 0% 100%,rgba(91,233,201,.12),transparent 60%)}
body::after{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* nav */
header.top{position:sticky;top:0;z-index:60;backdrop-filter:blur(14px);background:rgba(8,11,16,.66);border-bottom:1px solid var(--line)}
.top-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:12px;font-family:"Syne",sans-serif;font-weight:800;letter-spacing:.02em;font-size:19px;color:var(--text);text-decoration:none}
.mark{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#06121A;font-weight:800;font-size:16px;box-shadow:0 0 22px rgba(91,233,201,.45)}
nav.menu{display:flex;gap:28px;font-size:14px}
nav.menu a{color:var(--muted);text-decoration:none;position:relative;padding:4px 0;transition:color .3s}
nav.menu a:hover{color:var(--text)}
nav.menu a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--accent);transition:width .35s ease}
nav.menu a:hover::after{width:100%}

/* hero (shared) */
.hero{position:relative;min-height:78vh;display:flex;align-items:flex-end;
  background-size:cover;background-position:center;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,11,16,.35) 0%,rgba(8,11,16,.55) 45%,rgba(8,11,16,.97) 100%)}
.hero .wrap{width:100%;padding-bottom:70px;padding-top:120px}
.eyebrow{font-family:"JetBrains Mono",monospace;font-size:13px;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);display:inline-flex;align-items:center;gap:12px;margin-bottom:24px}
.eyebrow::before{content:"";width:36px;height:1.5px;background:var(--accent)}
.hero h1{font-family:"Syne",sans-serif;font-weight:800;font-size:clamp(44px,9vw,96px);line-height:.95;letter-spacing:-.02em}
.hero h1 .dot{color:var(--accent)}
.hero .sub{font-size:clamp(16px,2.4vw,21px);color:#C7CED8;margin-top:20px;font-weight:300;max-width:620px;letter-spacing:.02em}
.hero .facts{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:32px;font-family:"JetBrains Mono",monospace;font-size:12.5px;color:var(--muted)}
.hero .facts span{display:inline-flex;align-items:center;gap:9px}
.hero .facts span::before{content:"";width:6px;height:6px;background:var(--accent);transform:rotate(45deg)}
.scrollcue{position:absolute;right:30px;bottom:26px;z-index:3;font-size:12px;letter-spacing:.2em;color:var(--faint);animation:bob 2.4s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0);opacity:.7}50%{transform:translateY(6px);opacity:1}}

/* section */
section.block{padding:88px 0;position:relative}
.sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:42px}
.sec-no{font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--accent);letter-spacing:.1em}
.sec-title{font-family:"Syne",sans-serif;font-weight:700;font-size:clamp(24px,4.4vw,40px);letter-spacing:-.01em}
.sec-sub{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--faint);margin-left:auto;letter-spacing:.08em}

/* project meta row */
.pmeta{display:flex;flex-wrap:wrap;gap:18px 48px;border:1px solid var(--line);border-radius:14px;padding:24px 28px;background:var(--surface);margin-bottom:8px}
.pmeta .it .k{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.12em;color:var(--faint);text-transform:uppercase}
.pmeta .it .v{font-size:15px;color:#E3E9F0;margin-top:4px}

/* detail lead */
.lead2{font-size:clamp(19px,2.5vw,26px);font-weight:300;color:#D8DEE6;line-height:1.65;max-width:780px}
.lead2 b{color:#fff;font-weight:500}
.lead2 .hl{color:var(--accent)}

/* 3-column detail */
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.col{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:26px 24px;transition:transform .4s,box-shadow .4s,border-color .4s}
.col:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--line-strong)}
.col .n{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--accent);letter-spacing:.1em}
.col h3{font-size:18px;font-weight:600;margin:10px 0 10px;color:#EAF0F6}
.col p{font-size:14px;color:var(--muted);line-height:1.7}

/* steps */
.steps{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--surface)}
.step{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:24px 26px;border-bottom:1px solid var(--line)}
.step:last-child{border-bottom:none}
.step .n{font-family:"Syne",sans-serif;font-weight:800;font-size:22px;color:var(--accent)}
.step h4{font-size:17px;font-weight:600;margin-bottom:6px;color:#EAF0F6}
.step p{font-size:14.5px;color:var(--muted);line-height:1.7}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{padding:9px 16px;border:1px solid var(--line);border-radius:999px;font-family:"JetBrains Mono",monospace;font-size:12.5px;color:var(--muted);background:var(--surface);transition:border-color .3s,color .3s}
.chip:hover{border-color:var(--accent);color:var(--text)}

/* stats (reuse) */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--surface)}
.stat{padding:36px 20px;text-align:center;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat .num{font-family:"Syne",sans-serif;font-weight:800;font-size:clamp(32px,4.6vw,48px);line-height:1;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .num small{font-size:.45em;-webkit-text-fill-color:var(--muted);font-weight:600}
.stat .lbl{font-size:13px;color:var(--muted);margin-top:12px}

/* back link */
.back{display:inline-flex;align-items:center;gap:10px;font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--muted);text-decoration:none;margin-top:8px;transition:color .3s,gap .3s}
.back:hover{color:var(--accent);gap:14px}

/* footer */
footer{background:var(--surface);border-top:1px solid var(--line);padding:84px 0 40px;position:relative;z-index:2}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:54px;align-items:start}
footer h2{font-family:"Syne",sans-serif;font-weight:800;font-size:clamp(30px,6vw,52px);line-height:1.04;letter-spacing:-.01em}
footer h2 .em{color:var(--accent)}
.foot-note{color:var(--muted);margin-top:20px;font-size:15px;max-width:430px;line-height:1.75;font-weight:300}
.foot-contact{display:grid;gap:12px}
.foot-contact a,.foot-contact .row{display:flex;align-items:center;gap:14px;color:var(--text);text-decoration:none;font-size:14.5px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;transition:border-color .3s,background .3s}
.foot-contact a:hover{border-color:var(--accent);background:rgba(91,233,201,.08)}
.foot-contact .k{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--accent);letter-spacing:.1em;min-width:56px}
.copy{margin-top:54px;padding-top:24px;border-top:1px solid var(--line);font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--faint);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.bei{margin-top:14px;font-family:"JetBrains Mono",monospace;font-size:12px;letter-spacing:.06em;color:var(--faint)}
.bei a{color:var(--faint);text-decoration:none;border-bottom:1px solid var(--line-strong);transition:color .3s,border-color .3s}
.bei a:hover{color:var(--accent);border-color:var(--accent)}

/* ===== homepage specific ===== */
/* about */
.about{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:start}
.lead{font-size:clamp(19px,2.5vw,26px);font-weight:300;color:#D8DEE6;line-height:1.7;max-width:820px}
.lead b{color:#fff;font-weight:500}
.lead .hl{color:var(--accent)}
.meta{display:grid;gap:4px}
.meta .row{display:flex;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.meta .row:last-child{border-bottom:none}
.meta .k{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--accent);letter-spacing:.1em;min-width:64px;text-transform:uppercase;padding-top:2px}
.meta .v{font-size:15px;color:#E3E9F0}

/* capability cards */
.caps{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.cap{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px 26px;transition:transform .4s,box-shadow .4s,border-color .4s}
.cap:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--line-strong)}
.cap .n{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--accent);letter-spacing:.1em}
.cap h3{font-size:19px;font-weight:600;margin:10px 0 10px;color:#EAF0F6}
.cap p{font-size:14.5px;color:var(--muted);line-height:1.7}

/* work cards */
.works{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.work{position:relative;display:block;color:inherit;text-decoration:none;border-radius:16px;overflow:hidden;border:1px solid var(--line);background:var(--surface);transition:transform .5s,box-shadow .5s,border-color .5s}
.work:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--accent)}
.work .img{height:200px;background-size:cover;background-position:center}
.work .body{padding:22px 24px 28px}
.work .tag{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.12em;color:var(--accent);text-transform:uppercase}
.work h3{font-size:19px;font-weight:600;margin:10px 0 10px;color:#EAF0F6}
.work p{font-size:14px;color:var(--muted);line-height:1.7}

/* reveal (safe fallback: visible if JS disabled) */
.reveal{opacity:1}
.js .reveal{opacity:0;transform:translateY(28px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.js .reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}

@media(max-width:880px){
  .about{grid-template-columns:1fr;gap:30px}
  .caps{grid-template-columns:1fr}
  .works{grid-template-columns:1fr}
  .cols{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:none}.stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--line)}
  .foot-grid{grid-template-columns:1fr;gap:36px}
  nav.menu{display:none}
}

/* ===== mobile H5 (≤600px) ===== */
@media(max-width:600px){
  .wrap{padding:0 20px}
  section.block{padding:60px 0}
  .hero{min-height:74vh}
  .hero .wrap{padding-top:96px;padding-bottom:54px}
  .hero h1{font-size:clamp(38px,12vw,64px);line-height:1.02}
  .hero .sub{font-size:16px;font-weight:400;line-height:1.75}
  .hero .facts{flex-direction:column;align-items:flex-start;gap:9px;font-size:11.5px}
  .eyebrow{font-size:12px;margin-bottom:18px}

  .sec-head{flex-wrap:wrap;gap:8px 14px;margin-bottom:30px}
  .sec-title{font-size:clamp(22px,6.5vw,30px)}
  .sec-sub{margin-left:0;width:100%;font-size:11px}

  /* 细体中文字在手机低清屏上发虚/扁平 → 转常规字重 */
  .lead,.lead2{font-weight:400;font-size:clamp(17px,4.6vw,21px);line-height:1.8}
  .lead2 b,.lead b{font-weight:600}
  .foot-note{font-weight:400;font-size:14px}

  .about{gap:26px}
  .meta .v{font-size:14px}
  .cap{padding:22px 20px}
  .cap h3{font-size:18px}
  .cap p{font-size:14px}
  .work .img{height:170px}
  .work .body{padding:20px 20px 24px}
  .work h3{font-size:18px}

  .pmeta{gap:14px 18px;padding:18px 18px}
  .pmeta .it .v{font-size:14px}

  .cols{gap:16px}
  .col{padding:22px 20px}
  .col h3{font-size:17px}
  .col p{font-size:13.5px}

  .steps .step{grid-template-columns:40px 1fr;gap:14px;padding:20px 18px}
  .steps .step .n{font-size:18px}

  .stats{grid-template-columns:repeat(2,1fr)}
  .stat{padding:26px 12px}
  .stat .num{font-size:clamp(28px,9vw,40px)}
  .stat .lbl{font-size:12px;margin-top:10px}

  .chips{gap:8px}
  .chip{padding:8px 13px;font-size:11.5px}

  footer{padding:64px 0 34px}
  footer h2{font-size:clamp(26px,8vw,38px)}
  .foot-contact a,.foot-contact .row{padding:13px 15px;font-size:14px}
  .foot-contact .k{min-width:48px}
  .copy{flex-direction:column;gap:8px;font-size:11px}
  .bei{font-size:11px;line-height:1.6}
  .scrollcue{display:none}
}

/* ===== small phone (≤380px) ===== */
@media(max-width:380px){
  .hero h1{font-size:clamp(34px,13vw,52px)}
  .stats{grid-template-columns:1fr}
  .stat{border-right:none;border-bottom:1px solid var(--line)}
  .stat:last-child{border-bottom:none}
  .pmeta{gap:10px 12px}
}